Bandsaw-sharpening machine

ABSTRACT

The invention relates to a bandsaw-sharpening machine comprising a rotating abrasive wheel, a mechanism for pitch feed of the saw with relation to the abrasive wheel, and a mechanism for working feed of the saw towards the abrasive wheel, said mechanisms being installed rotatably in the plane of the saw for ensuring the resetting of the machine to suit the value of the front toothsharpening angle, and a clamping device mounted with a provision for being transferred along the saw on the working feed mechanism for resetting the machine to suit the shape of the teeth of the saws being sharpened.

United States Patent Vladimir Viktorovich ldel ulitsa Graftio, 15, kv.6;

Jury Vasilievich Tishin, ulitsa Michurina, 26, kv. 12, both of ZavolzhieGorkovskoi [72] lnventors Oblasti, U.S.S.R. [21] Appl. No. 22,326 [22]Filed Mar. 24, 1970 [45] Patented Oct. 12, 1971 [32] Priority Dec. 8,1969, Jan. 12, 1970' [33'] U.S.S.R. [31] 1378202 and 1387555 [54]BANDSAW-SHARPENING MACHINE 3 Claims, 5 Drawing Figs.

[52] US. Cl 76/37, 76/41, 76/43, 76/112 [51] Int. Cl B23d 63/12 [50]Field of Search 76/37, 40,

[56] References Cited UNITED STATES PATENTS 2,379,642 7/1945 Kiechle76/41 2,434,691 1/1948 Fields 76/37 Primary Examiner-Bernard StickneyAttorneyWaters, Roditi, Schwartz & Nissen ABSTRACT: The inventionrelates to a bandsaw-sharpening machine comprising a rotating abrasivewheel, a mechanism for pitch feed of the saw with relation to theabrasive wheel, and a mechanism for working feed of the saw towards theabrasive wheel, said mechanisms being installed rotatably in the planeof the saw for ensuring the resetting of the machine to suit the valueof the front tooth-sharpening angle, and a clamping device mounted witha provision for being transferred along the saw on the working feedmechanism for resetting the machine to suit the shape of the teeth ofthe saws being sharpened.

PATENTED mm 1 21971 SHEET 1 0F 4 an m PATENTED new 2197:

SHEET 3 BF 4 n mi BANDSAW-SIIARPENING MACHINE The present inventionrelates to the bandsaw-sharpening machines and more particularly itrelates to the machines in which the saw is sharpened in a floating"position.

Known from the earlier applications by the same applicant are suchmachines comprising a rotating abrasive wheel installed on the machinebed, a mechanism for pitch saw feed relative to the abrasive wheel, anda mechanism for working feed of the saw onto the abrasive wheel, saidmechanism carrying a saw-clamping device formed by a spring-loaded stopat the back side of the saw, two stationary stops at the tooth side ofthe saw and two spring-loaded stops holding the saw from the sides.

Such clamping of the saw allows it to float in the process ofsharpening, i.e., to turn somewhat in its plane with relation to one ofthe stationary stops located at the tooth side and to move progressivelyin the direction contrary to the pitch feed.

Practical experience has proved the advantages of the machines with afloating" clamping of the saw as compared with the known machines withthe rigidly clamped saw.

The sharpening speed in the machine rises to 400 teeth per minute andover, the quality of sharpening being somewhat improved too.

However, resetting of the known machines for sharpening the saws withdifferent shapes of the teeth is difficult because it involves the useof several types of saw-clamping devices.

Besides, the known machines are not adapted for joint sharpening andsetting of the endless bandsaws with a large toothsharpening front anglebecause when the saw is set for the required front-sharpening angle, thesides of the saw become so displaced that the latter cannot be insertedinto the setting mechanism.

An object of the invention is to eliminate the aforesaid disadvantages.

To accomplish this object, the author hereby claims a machine which ismore versatile with regard to resetting owing to a new layout of theworking and pitch feed mechanisms and of the clamping device.

The machine of the present invention comprises a rotating abrasive wheelinstalled on the machine bed, a mechanism for pitch feed of the saw withrelation to the abrasive wheel and a mechanism for working feed of thesaw onto the abrasive wheel, said mechanism carrying the saw-clampingdevice; said device allows the saw to be turned in its plane and movedprogressively to a certain extent in the direction contrary to the pitchfeed. According to the invention, the improvement consists in that themechanisms of working and pitch feeds of the saw are installed with aprovision for being turned through a certain angle in the plane parallelto the saw, said angle being determined by the front toth-sharpeningangle, that they have devices for locking them on the bed in therequired position, and that the clamping device is adapted for beingtransferred on the working feed mechanism along the saw.

In one version it is suggested to install the working and pitch feedmechanisms on a common tumplate which is rotatably installed on the bedparallel to the saw surface and is provided with a device for locking itin the required position on the bed after turning.

In another version it is suggested to install the working and pitch feedmechanisms on separate turnplates which are mounted on the bed with aprovision for turning relative to each other and parallel to the sawsurface, and have devices for locking them on the bed in the requiredposition after turnmg.

This improvement facilitates considerably the resetting of the machine.

In this case saws with different shapes of teeth can be sharpened byonly one clamping device, setting it in the required position along thesaw, whereas the known machines must have a number of replaceableclamping devices, used, each, for a definite shape of the saw teeth.

By turning the working and pitch feed mechanisms with rotation to thebed it is always possible to set the saw sides parallel to each otherthereby ensuring simultaneous sharpening and setting of the saw.

The invention will become more apparent from the description of itsembodiments and accompanying drawings, in which:

FIG. 1 shows the machine of the present invention in axonomic projectionand its general diagram of mechanism;

FIG. 2 is a top view of the machine with the working and pitch feedmechanisms mounted on a common tumplate;

FIG. 3 is a side view ofthe same machine shown in FIG. 2;

FIG. 4 is a top view of the machine with the working and pitch feedmechanisms mounted on separate turnplates;

FIG. 5 is a side view ofthe machine shown in FIG. 4.

As shown in FIG. 1 the machine of the invention comprises a bed 1divided vertically into two platforms, the upper platform carrying asharpening stock 2 with the rotating abrasive wheel 3 and a mechanism 4for the working feed of the saw 5 onto the abrasive wheel 3 with aclamping device 6 for holding the saw 5, and a mechanism 7 for pitchfeed of the saw with relation to the abrasive wheel 3, all these unitsforming the sharpening assembly.

The lower platform of the bed 1 mounts an impact-setting mechanism 8 ofany known design which is not dealt with herein as irrelevant.

One side of the saw 5 to be sharpened is passed through the sharpeningassembly and its other side, through the setting mechanism 8 as can beseen in FIG. I. v

The working feed mechanism 4 comprises a slide 9 which is reciprocatedin the guides (not shown) of the base 10 by a crank mechanism II thelatter being rotated by a motor I2 via a kinematic chain 13. The slide 9carries a plate 14 to which the clamping device 6 of the saw 5 issecured,

The clamping device 6 comprises a spring-loaded stop 15 (FIG. 1 and 2)at the back side of the saw 5, two spring-loaded side stops 16 (upperand lower ones) and two stationary stops 17 and 18 at the tooth side ofthe saw.

The saw 5 is set between the stop 15 and the stops I7, 18, being guidedduring its feed by the stops 16. All these stops except stop I8 aremounted in the housing 19 of the clamping device 6 whereas the stop 18is installed on the body 20 of the pitch feed mechanism 7 as shown inFIGS. 1,2 and 4.

Owing to the provision of the spring-loaded stop IS, the saw 5 can turnin its plane during sharpening through a certain preset angle withrelation to one of the stops 17 or 18, depending on the relativepositions of the abrasive wheel 3 and stop 15, and move progressivelyover a certain distance in the direction contrary to the pitch feed. Ifthe abrasive wheel 3 is located in front of the stop 15 in the directionof the pitch feed of the saw, the latter will turn with relation to thestop 17.

If the abrasive wheel 3 is set behind the stop 15 in the direction ofthe pitch feed of the saw, the latter will turn with relation to thestop 18. i

The pitch feed mechanism 7 of the saw 5 is provided with a pawl 21 whichengages periodically the teeth of the saw 5, and is reciprocating andswinging simultaneously. Such a complex motion of the pawl 21 is ensuredby securing it on the slide 22 (FIGS. 1 through 5) which moves in theguides (not shown) of the body 20 of the mechanism 7, the latter beingfastened to the plate 14 of the slide 9, said plate supporting theclamping device 6.

At the same time the slide 22 has a vertical pivot 23 with a roller 24which enters the slot 25 arranged at an angle to the saw 5 and locatedin the plate 26 fastened to the bed 1.

Thus, the working feed of the saw 5 onto the abrasive wheel 3 as well asthe pitch feed is ensured by the operation of the crank mechanism 11.

To reset the machine for simultaneous sharpening and setting of the sawteeth, the base 10 of the mechanism 4 and the plate 26 of the mechanism7 are secured in one version of the invention on a common tumplate 27(FIGS. 2 and 3) which has curved slots 28 and 29 for the fastening bolts30 and 31 intended to fix the plate 27 in the required position on thebed 1. The plate 27 is installed parallel to the plane of the saw 5.

By turning this plate 27 in its slots 28 and 29 with relation to thebolts 30 and 31, around the pivot 32 of the crank mechanism 11, andsimultaneously, the working and intermit tent feed mechanisms 4 and 7,said mechanisms are thus oriented to suit the front-sharpening angle ofthe teeth of the saw 5.

Then the plate 14 of the slide 9 is turned together with the clampingdevice 6 and with the body 20 of the mechanism 7 until the upper side ofthe saw is brought precisely above the lower side. It is obvious thatthis will displace the clamping device 6 with relation to the pawl 21 ofthe pitch of feed mechanism 7. Therefore, to make the pawl 21 engage thesaw 5, the plate 26 is moved in the curved slot 33 of the baseplate 27and fixed in the required position by bolt 34.

If there is a large difference of the front tooth-sharpening angles(from 0 to 40), it is practicable that the turnplate 27 be replaced bytwo separate plates 35 and 36 which are rotatable in the plane of thesaw (FIGS. 4 and S), installing the base of the mechanism 4 on the plate35, and the plate 26 of the mechanism 7, on the plate 36.

The plate 36 has perpendicular slots 37 and 38 with the fastening bolts39 passing through them, while the plate 35 has slots 40 and 41(analogous to the slots 28 and 29 in the plate 27) with bolts 30 and 31passing through them.

While sharpening the saws with the teeth of different shape, i.e., whilechanging from sharpening the saws with the teeth whose long side isinclined in the direction of the pitch feed of the saw to sharpening thesaws with the long side of the teeth inclined against the pitch feed ofthe saw, it is also necessary to reset the machine in order to increasethe quality and speed of tooth sharpening to a maximum.

This resetting is accomplished by transferring the clamping device 6with relation to the abrasive wheel 3 along the saw, i.e., by changingthe relative positions of the stop of the clamping device 6 and oftheabrasive wheel 3 which has been mentioned above.

For this purpose the plate 14 of the working feed 4 has a number ofholes 42 for the fastening bolts 43 which fix the clamping device 6 inthe required position.

Thus, the stop 15 must be installed in front of the abrasive wheel 3 inthe direction of the pitch feed when the saw has teeth with their longside inclined against the direction of pitch feed; conversely, the stop15 must be installed behind the abrasive wheel 3 in the direction ofpitch feed when the long side of the saw teeth points in the oppositedirection The invention facilitates considerably the resetting of themachine and increases its output.

Though the machine is intended for sharpening bandsaws, it can be usedfor sharpening other cutting tools for which purpose another type of theclamping device must be provided.

We claim:

1. A bandsawsharpening machine comprising: a bed of said machine, anabrasive wheel mounted on said bed, a means for rotating said abrasivewheel, a mechanism for pitch feed of the saw with relation to theabrasive wheel, a mechanism for working feed of the saw towards saidabrasive wheel, both mechanisms being installed on the bed with aprovision for forced turning through a certain angle in the planeparallel to the saw, said angle being determined by the fronttooth-sharpening angle and having a means for their fixing on the bed inthe required position after turning, a saw-clamping device allowing thesaw to be turned during sharpening in its plane and to be movedprogressively in the direction contrary to the pitch feed; said clampingdevice is installed on said working feed mechanism and is adapted forbeing moved on this mechanism along the saw.

2. A machine according to claim I wherein the working and pitch feedmechanisms are mounted on a common tumplate installed rotatably on themachine bed parallel to the saw plane and provided with a device forfixing it on the bed in the required position after turning.

3. A machine as claimed in claim 1 wherein the working and pitch feedmechanisms are mounted on separate turnplates installed rotatably withrelation to each other in the machine bed and parallel to the saw plane,and provided with devices for iixing them on the bed in the requiredposition after turn-

1. A bandsaw-sharpening machine comprising: a bed of said machine, anabrasive wheel mounted on said bed, a means for rotating said abrasivewheel, a mechanism for pitch feed of the saw with relation to theabrasive wheel, a mechanism for working feed of the saw towards saidabrasive wheel, both mechanisms being installed on the bed with aprovision for forced turning through a certain angle in the planeparallel to the saw, said angle being determined by the fronttooth-sharpening angle and having a means for their fixing on the bed inthe required position after turning, a saw-clamping device allowing thesaw to be turned during sharpening in its plane and to be movedprogressively in the direction contrary to the pitch feed; said clampingdevice is installed on said working feed mechanism and is adapted forbeing moved on this mechanism along the saw.
 2. A machine according toclaim 1 wherein the working and pitch feed mechanisms are mounted on acommon turnplate installed rotatably on the machine bed parallel to thesaw plane and provided with a device for fixing it on the bed in therequired position after turning.
 3. A machine as claimed in claim 1wherein the working and pitch feed mechanisms are mounted on separateturnplates installed rotatably with relation to each other in themachine bed, and parallel to the saw plane, and provided with devicesfor fixing them on the bed in the required position after turning.